Belt drive for small diameter adjacent cylinders



I:LE- 5 INVENTOR.

Oct. 21, 1952 Q RMHEY 2,614,440

BELT DRIVE FOR SMALL DIAMETER ADJACENT CYLINDERS Filed June 26, 1951 CLARIVC 8. RIC/I67 Patented Oct. 21, 1 952 'BELT DltIVE FOR SMALL DIAMETER ADJACENT CYLINDERS Clarence B. ltic heyp lioyal Oak, Mich., assignor to Dearborn -Motors Corporation, Birmingham, 7 Mich., a corporation of Delaware Application June-26, 1951, Serial No. 233,633 I I i This invention relateslto a belt drive for. small diameter rolls or cylinders arranged in. sideby .side, generally parallel relationship.

.Belt drives for driving, various elements of a machine constitute a convenient and generally economical way of effecting the transmission of .power to such elements. A serious drawback with any belt drive is that. thediameter of thejpulley .must be maintained abovefa certain minimum;

otherwise the belt willbelsubjected to abnormal stresses resulting in rapid breakdown of the. belt. A further disadvantage of small diameter pulleys is that slippage iofthe belt on the pulley is hard to avoid.

\ In certain drive applications in farm machinery I where a pair of. adjacent'rolls mustibe drivenin oppositely rotating directions; it has been quite a problem to utilize a belt .drivefor. such rolls which will produce the required torquev in the adjacent cylinders or rolls to. meet'the service requirements. Somefarm implements, such as cotton strippers, cornpickers orhay crushers,

generally utilize a pair of adjacent rolls ofv relativelyqsmall diameter, relative. to their length, for

harvesting or otherwisetreating the crop. Here.-

..tofore ithas been necessary to, utilize a relatively expensive gear train for driving-such rolls...

It is, therefore, an object of this inventionto provide an improved belt drive for a pair of small diameter rolls arranged in side by side relationship.

; Another object of this invention is to'provide an improved belt drive for a pair of adjacent substantially parallel small diameter rolls which not only substantially eliminates belt slippage but alsorotates the rolls in opposite directions.

The I specific nature of this invention,- as well as other objects and advantages thereof, will become apparent to those skilled in the art from the following detailed description, taken in conjunction with the attached sheet of drawings on which, by way of preferred example only, is illustrated one embodiment of this invention.

On the drawings:

Figure 1 is a front view showing the improved driving arrangement constructed in accordance with this invention.

Figure 2 is a plan view of Figure 1.

Figure 3 is a left end view of Figure 1.

As shown on the drawings:

In Figure 2 of the appended drawing, there is shown a pair of adjacent rolls II] and II which are disposed in generally parallel relationship. Rolls I and I I are only shown schematically and may represent the snapping rolls of a corn picker,

ioiai s. (01. 74-722) rolls Ill and II for the particular for vertical movement on the implement the crushing rolls of a hay crusher or the stripping brushes of a cotton stripping machine. Rolls Ill and II are respectively "provided with'faxiial shafts Ilia and I la which project somewhat'be yond the right-hand end of 'rolls I0 and I I,f "as best shown in Figure 2. Shaft I Ia projects somewhat beyond the end of shaft I 6a so that a pulley I2 secured to the end of shaft IIa overlaps'an identical, pulley I3 secured to the end-or shaft Illa as best shownin Figuresfl and 2. Duetoth'e relatively small diameter of rolls I0 and Ill'anld to the requirement for the'close side by side arrangement of such rolls in order for'them tofun'ction properly, the overlapped arrangement 'of pulleys I2 and I3 permits the use of sufficiently large diameter pulleys to provide substantial'belt engagement with the peripheries of such pulleys so thata desiredtorque will be imparted'I'tof-the A operationsl'lch rolls are required to perform. A power input or'drive'shaft I4 has a drive pulley I5 secured to its'endI Shaft I4, and hence pulley I5, are disposed adjacerlt'theleft hand side of pulley I2 as shown in Figure 1. ,The' shaft I4, however, has its axis skewed 'relativelfto the axes of rolls I0 and 'II asbest' shown in H 1 2 and 3; thus pulley I5 is cooked so that the p r and lower edges thereof (asviewed inFigu 5,2 and 3) are substantially aligned respe'ctive'ly iith the edges of overlapping pulleys I2a'n'd T3-Qfor a purpose to presently appear. An idler pulleyif I6, which also serves to tension and direct a belt I8 is rotatabl mounted'bya stub shaft Hialbnfla depending arm I1.- Arm I1 is adj'ustably mounted shown) whereby the pulley may be jve'rti moved for .tensioning of the belt I8. The tical axis of pulley I6 ispreferably located midway between the pulleys I2 and I3 as best shown in Figure 1, and such pulley is positioned above pulleys I2 and I3. The stub shaft axis is likewise skewed relative to the axes of rolls III and II to respectively align its front and rear edges with pulleys I2 and I3, as best shown in Figure 2.

All of the pulleys above described are respectively provided with peripheral grooves of generally V-shaped configuration to receive a V-shaped rubber belt I8. Belt I8, however, is of the socalled double V type thereby defining a substantially hexagonal cross sectional configuration. Belt I8 is trained over the top of driving pulley I5 and has a lower portion I 8a departing from (as viewed in Figure l) or belt entering portion I8 surrounds the right hand portion 13a of pulley l3. Idler pulley 16 has a belt entering portion l6?) and belt I8 is directed thereabouts from the belt departing portion [3b of pulley I3, thus providing substantially more than a 90 lap of belt l8 on such pulley. Pulley l2 has a belt entering portion l2a and a belt departing portion I22); and the'uppernbelt portion lab is directed aroundsuch pulley withthe belt l8 respectively entering and leaving the pulley at the points We and l2b, thus providing substan-' tially more than a 90 lap of the belt l8 onpulle [2. e tering portion 15b of drive pulley l5. The belt I8 is properly tensioned by vertically:adjusting pulley l6.

Referring to Figure 1, it is obvious that belt l8, as trained over the various pulleys willproduce an opposite rotation of the pulleys l2 and I3 whereby the adjacent rolls and! l'will'be oppositely rotated. It will be noted that the slightoocking of pulleys 15 and l6, providedby respectively "skewing theinshafts IA- an'd- [6a, is necessary to "align the belt-with the edges of lpulleys Hand 13. Figures 2 and-3 best show "the cooked arrangement'of such-pulleys. Driving ipulley' VI 5 may be of relatively small diameteras belt l8 contacts substantially the entire, periphery "of "such pulley, "thus eliminating substantially all belt-slippage at this point. The relatively large-diameter of the overlapping pulleys l2 and I3,-"and the disposition of pulleys l5 :and I8 relative thereto, permit considerable en- ,gagementthereoPby belt 18. Thus'a relatively "large torque-forcemay "be imparted to rolls [0 and ll*withoutbeltslippage.

From the "above description it isclearly apparentthat there'isjhere provided an improved "belt"driving arrangement 'for relatively small "diameter rolls arranged in-sideby side relationship, which is a more economical "and convenient "way .of effecting driving of the adjacent rolls ithan' gearing arrangements-heretofore employed. 'f'It" will; of o'urse, "be understood that many details of construction "may "be varied through a wide range "without departing from the principles'oi this invention "and it is, therefore, "not the purpose to limit the patent granted hereon otherwisethan necessitated by the scope "of the "appended claims;

1. "Adriving "arrangement for rotating apair 'ofiadjacentshafts 'comprisinga pair of "driven pulleys respectively secured to "theshafts in "axially "spaced relationship, a drive pulleypan "idlerjpulley and a'singlebelt' trainedover all of said -pulleys, said drive pulley being disposed vv'ithits belt entering portion "generally aligned parting portion of said other driven pulley and Belt 18 is then directed over' the belt the belt departing portion of said idler pulley is 4 with the belt departing portion of one of said driven pulleys'and with its belt departing portion generally aligned with the belt entering portion of the other of said driven pulleys, said idler pulley being disposed relative to said driven pulleys to provide greater than lap of said belt on, each of-said driven pulleys; and said idler pulley being inclined relative tosaid driven pulleys so that the belt entering portion of said idler pulley is substantially aligned with the belt desubstantially aligned with the belt entering portionofsaid one driven pulley.

-2.-A driving arrangement for rotating a pair of adjacent relatively small diameter, parallel rolls comprising a pair of driven pulleys respectively secured to the rolls in axially spaced relationship, said pulleys being of a'larger diameter than the rolls so that said pulleys are in overlappingrelationship, a drive pulley,;an.idler pulley and-a single belt trained over:all.of said pulleys, said drive pulleybeing disposed with its belt entering portion generally aligned with .the belt departing .portion :of one "of said driven :pulleys -;and with .its belt departing portion genrerally aligned with the belt entering' portion .of the other of said driven pulleys, said .idler pulley being .disposedrelative :to said .driven.:pulleys:to

:provide' greater than-.90 lap of saidixbelt .on :each

of said driven pulleys, and. said idler :pulley be- :ing .inclin'ed relative .to said driven pulleys .so that the belt'enteringzportion .of said idler :p'u'lley is substantially aligned with the belt departing portion ofxsaid other ldriven, pulley andzthe tbelt departing portion -of said idler :pulley is sub- .stantially aligned with 'thelbeltoentering iportion IGf said onedrivenpulley.

:3. .The combination'definedin claim .1 wherein'oppositelyimoving .portions .of .said belt re- :spectively :contact similarsides of said driven pulleys, thereby producing :opposite rotation :of said. shafts.

:4. "The combination defined in :claim 2iwherein oppositely'moving. portionsofxsaid .belt respectively contact similar sides.of said driven pulleys, thereby producing :opposite rotation o! :'said; rolls.

REFERENCES orrEn UNITED STATES "PA'I'E'NTS Name Date Bradford June 28,192?

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